The new driving test seems to be challenging so the chances he can pass it at the first a

问题补充：

The new driving test seems to be challenging，so the chances he can pass it at the first attempt are small.

A. how

B. whether

C. that

D. where

答案：

A. how

B. whether

(答案→)C. that

D. where

解析：

句意为： 新的驾考似乎具有挑战性，所以他第一次通过的可能性很小。the chance(s) that...“……的机会”。